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Chapter 12: Q. 25 (page 764)
Confidence intervals and tests for these data use the t distribution with degrees of freedom
(a) 9.29.
(c) 15.
(e) 30.
(b) 14.
(d) 16.
(b) 14
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SAT Math scores In Chapter 3, we examined data on the percent of high school graduates in each state who took the SAT and the state's mean SAT Math score in a recent year. The figure below shows a residual plot for the least-squares regression line based on these data. Are the conditions for performing inference about the slope of the population regression line met? Justify your answer.
A local investment club that meets monthly has members ranging in age from . A cumulative relative frequency graph is shown below. Approximately how many members of the club are more than years of age?
(a) 20 (b) 44 (c) 78 (d) 90 (e) 110
A study of road rage asked random samples of men and women about their behavior while driving. Based on their answers, each respondent was assigned a road rage score on a scale of to . The respondents were chosen by random digit dialing of telephone numbers. Are the conditions for two-sample t inference satisfied?
(a) Maybe. The data came from independent random samples, but we need to examine the data to check for Normality.
(b) No. Road rage scores in a range between and can’t be Normal.
(c) No. A paired t test should be used in this case.
(d) Yes. The large sample sizes guarantee that the corresponding population distributions will be Normal.
(e) Yes. We have two independent random samples and large sample sizes, and the condition is met.
Of the 98 teachers who responded, said that they had one or more tattoos.
(a) Construct and interpret a confidence interval for the actual proportion of teachers at the AP institute who would say they had tattoos.
(b) Does the interval in part (a) provide convincing evidence that the proportion of teachers at the institute with tattoos is not (the value cited in the Harris Poll report)? Justify your answer.
(c) Two of the selected teachers refused to respond to the survey. If both of these teachers had responded, could your answer to part (b) have changed? Justify your answer
In Chapter 3, we examined data on the body weights and backpack weights of a group of eight randomly selected ninth-grade students at the Webb Schools. Some Minitab output from least-squares regression analysis for these data is shown
1. What conditions must be met for regression inference to be appropriate?
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